| Abstract: | Ultrasonic phased array technology has been gradually applied to industrial nondestructive testing in recent years. The sound field of the focusing and steering beam radiating from the phased array is a nonuniform distribution in the spatial position so that the echo signals of same size defects will be changed according to defect positions. To analyze these defects quantitatively, a model-based method for the distance amplitude correction is proposed for the phased array system. Based on a non-paraxial multi-Gaussian beam model and flaw scattering models, an ultrasonic measurement model for the phased array system is proposed to calculate the echo signals from side-drilled holes at different positions. Furthermore, these model-based distance amplitude curves are compared with the traditional experimental results for different focusing and steering beams. The two methods have a good agreement. |
